drivers/network/tcpip/include/checksum.h

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS TCP/IP protocol driver
   4  * FILE:        include/checksum.h
   5  * PURPOSE:     Checksum routine definitions
   6  */
   7
   8 #pragma once
   9
  10 ULONG ChecksumFold(
  11   ULONG Sum);
  12
  13 ULONG ChecksumCompute(
  14     PVOID Data,
  15     UINT Count,
  16     ULONG Seed);
  17
  18 unsigned int
  19 csum_partial(
  20   const unsigned char * buff,
  21   int len,
  22   unsigned int sum);
  23
  24 ULONG
  25 UDPv4ChecksumCalculate(
  26   PIPv4_HEADER IPHeader,
  27   PUCHAR PacketBuffer,
  28   ULONG DataLength);
  29
  30 #define IPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
  31 #define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(csum_partial(Data, Count, Seed)))
  32 //#define TCPv4Checksum(Data, Count, Seed)(~ChecksumFold(ChecksumCompute(Data, Count, Seed)))
  33
  34 /*
  35  * Macro to check for a correct checksum
  36  * BOOLEAN IPv4CorrectChecksum(PVOID Data, UINT Count)
  37  */
  38 #define IPv4CorrectChecksum(Data, Count) \
  39     (BOOLEAN)(IPv4Checksum(Data, Count, 0) == DH2N(0x0000FFFF))
  40
  41 /*
  42  * Macro to check for a correct checksum
  43  * BOOLEAN TCPv4CorrectChecksum(PTCPv4_PSEUDO_HEADER TcpPseudoHeader,
  44  *   PVOID Data, UINT Count)
  45  */
  46 #define TCPv4CorrectChecksum(TcpPseudoHeader, Data, Count) \
  47     (BOOLEAN)(TCPv4Checksum(Data, Count, \
  48       TCPv4Checksum(TcpPseudoHeader, sizeof(TCPv4_PSEUDO_HEADER), \
  49       0)) == DH2N(0x0000FFFF))